Howto:VOIP through NAT routers: Difference between revisions
No edit summary |
mNo edit summary |
||
| Line 7: | Line 7: | ||
If the signaling crosses network borders you may get in trouble with private IP addresses. | If the signaling crosses network borders you may get in trouble with private IP addresses. | ||
If a | If a private signaling endpoint hands-out a private IP address (signaling or media) the external endpoint won't be able to reach that IP address. | ||
== What WILL work == | == What WILL work == | ||
The only leliable way to get the hole thing working is to handle the problem on the private network. | The only leliable way to get the hole thing working is to handle the problem on the private network.<br> | ||
Keep your private signaling endpoint from hand-out private IP addresses. | |||
=== What you need === | === What you need === | ||
| Line 25: | Line 25: | ||
=== How to configure === | === How to configure === | ||
Nothing to do on the private equipment. The | Nothing to do on the private equipment. The private signaling endpoint will hand-out private IP addresses. | ||
== What WON'T work == | == What WON'T work == | ||
Revision as of 12:27, 27 September 2007
Abstract
This page discusses NAT traversal of VOIP.
Introduction
VOIP signaling involves the exchange of IP addresses. Signaling addresses and media addresses RTP or T.38).
If the signaling crosses network borders you may get in trouble with private IP addresses. If a private signaling endpoint hands-out a private IP address (signaling or media) the external endpoint won't be able to reach that IP address.
What WILL work
The only leliable way to get the hole thing working is to handle the problem on the private network.
Keep your private signaling endpoint from hand-out private IP addresses.
What you need
You need a Fullcone NAT router and a STUN server in the public network.
How to configure
Configure the public STUN server on your private signaling endpoint. It will use STUN to create a NAT mapping on the fullcone NAT router. It will then hand-out the mapped IP addresses (signaling and media) instead of the private ones.
What MAY work
What you need
You need a NAT router that at least do symmetric NAT.
How to configure
Nothing to do on the private equipment. The private signaling endpoint will hand-out private IP addresses.